Riverhead Sewer District WWTF
Riverhead, NY · Suffolk County · Publicly Owned Treatment Works
- Average flow
- 0.97 MGD
- Design flow
- 1.4 MGD
- NPDES permit
- NY0020061
- Administratively continued
- Permit expires
- September 2016
- Population served
- 9,753
- CWNS 2022
Riverhead Sewer District WWTF is a publicly owned wastewater treatment works in Riverhead, Suffolk County, New York treating an average of 0.97 million gallons per day against a permitted design capacity of 1.4 MGD, serving about 9,753 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos. It discharges under NPDES permit NY0020061 (administratively continued), which expires in September 2016, with 7 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Riverhead Sewer District WWTF, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Riverhead Sewer District WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in New York
Shirley · 14 mi away
—
Sag Harbor · 19 mi away
0.08 MGD
Greenport · 19 mi away
0.36 MGD
Farmingville · 21 mi away
0.02 MGD
Patchogue · 23 mi away
0.38 MGD
Stony Brook · 25 mi away
2.09 MGD
Kings Park · 31 mi away
0.24 MGD
Ocean Beach · 33 mi away
0.17 MGD
Riverhead Sewer District WWTF: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated April 5, 2025.